title: Tungsten oxide buffer layers fabricated in an inert sol-gel process at room-temperature for blue organic light-emitting diodes.
abstract: WO3 deposition from tungsten ethoxide precursor solutions at room temperature is demonstrated. The W(OEt)6 precursor can be converted under inert conditions and hence avoids sample contamination with oxygen, opening a pathway to more stable devices. The stoichiometry of all WO3 layers and the optoelectronic performance of the respective SMOLEDs well match thermally evaporated WO3 and its corresponding SMOLEDs. The solution processed WO3 hole injection layers enable the fabrication of blue phosphorescent OLEDs with low onset voltage and current efficiencies of up to 14 cd A(-1) .
authors.affiliation: Light Technology Institute, Karlsruhe Institute of Technology (KIT), Engesserstrasse 13, Karlsruhe, Germany. stefan.hoefle@kit.edu
authors.forename: Stefan
authors.initials: S
authors.lastname: Höfle
authors.forename: Michael
authors.initials: M
authors.lastname: Bruns
authors.forename: Stefan
authors.initials: S
authors.lastname: Strässle
authors.forename: Claus
authors.initials: C
authors.lastname: Feldmann
authors.forename: Uli
authors.initials: U
authors.lastname: Lemmer
authors.forename: Alexander
authors.initials: A
authors.lastname: Colsmann
mesh_terms: D003116:Color; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008029:Lighting / Q000295:instrumentation*; D008422:Materials Testing; D008567:Membranes, Artificial; D009930:Organic Chemicals / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D044367:Phase Transition; D012666:Semiconductors; D013696:Temperature; D014414:Tungsten / Q000737:chemistry*
chemical_list: D008567:Membranes, Artificial; D009930:Organic Chemicals; D010087:Oxides; C511604:tungsten oxide; D014414:Tungsten
keywords: OLED; precursor; solution processing; tungsten oxide